The increased levels of telomerase associated with many tumor cells likely promote cancer by:

A、enhancing levels of DNA repair so that cells remain normal and have stable genomes and thus would be able to replicate their DNA and divide more often.

B、promoting the efficiency of the spindle-assembly checkpoint.

C、reducing the expression of several oncogenes.

D、allowing cells to continue to divide when normally chromosomes should shorten beyond a point where division would be no longer possible.

E、decreasing the number of epigenetic changes that would promote cancer.

提问人：网友lihaining655 发布时间：2022-01-07

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更多“The increased levels of telome…”相关的问题

第1题

_____ and _____ are chromosomal mutations that may activate cellular oncogenes by moving them to new regulatory sequences where they become overexpressed.

A、Duplications; deletions

B、Inversions; translocations

C、Duplications; inversions

D、Deletions; translocations

E、Aneuploidy; deletions

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第2题

Many tumors exhibit:

A、abnormally high levels of telomerase expression.

B、abnormally high levels of tumor-suppressor gene expression.

C、translocations that move a tumor-suppressor gene to a new location that increases its normal expression.

D、deletions that remove an oncogene from the genome.

E、DNA replication that is inhibited when it would normally occur.

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第3题

Which of the following statements is TRUE concerning the function of proto-oncogenes?

A、They make products that act as signals to initiate cellular apoptosis.

B、Their products are components of cell growth pathways.

C、Proto-oncogenes make products that act as cell checkpoint regulators.

D、Proto-oncogenes make products that scan the genome for DNA damage.

E、Proto-oncogenes make products that repair DNA at sites of lesions.

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第4题

A rare situation where only one of the two copies of a particular tumor-suppressor gene needs to be inactivated before there is a progression toward cancer is called:

A、clonal evolution.

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第5题

The presence of a single mutated gene is sufficient for retinoblastoma cancer to develop.

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第6题

Most cancers arise from defects in DNA.

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